Well, I've been working on an User-Agent based shared-session protection between subdomains.
I was extremely surprised that it's been working well until IE 11 preview was released recently. There are 2 subdomains
example.com and sub.example.com
I've intercepted requests to both domains and it seems that USER-AGENT HTTP Header being sent to each domain is different.
Request to example.com has:
User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; Trident/7.0; rv:11.0) like Gecko
Request to sub.example.com has:
User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; Trident/7.0; SLCC2; .NET CLR 2.0.50727; .NET CLR 3.5.30729; .NET CLR 3.0.30729; Media Center PC 6.0; .NET4.0C; .NET4.0E; BRI/1; MS-RTC LM 8; rv:11.0) like Gecko
Do you have any idea what is the reason for this strange dynamic behavior?